M thermal Mono
202008 85
4.25 Pb Troubleshooting
Digital display output 4.25.1
Description 4.25.2
Water side heat exchanger anti-freeze protection.
M thermal Mono stops running.
Pb is displayed on hydronic system main PCB and ANTI.FREEZE icon is displayed on user interface.
Possible causes 4.25.3
Normal system protection.
Procedure 4.25.4
Pb
1. Outdoor ambient temperature 3°C and water side heat
exchanger water outlet temperature/water inlet
temperature/backup electric heater outlet water
temperature 5
2. Water side heat exchanger water outlet temperature/water
inlet temperature/backup electric heater outlet water
temperature 2
Yes
Normal system protection. The
system will resume
automatically
1
Notes:
1. Refer to Part 3, 5.7 Water Side Heat Exchanger Anti-freeze Protection Control .
Midea CAC
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